Third parties per page
How many distinct third-party services the page embeds.
At a glance the headline numbers for Third parties per page
How many distinct third-party services the page embeds.
The typical site embeds 3 distinct third-party services.
Distribution & median INP site count and median INP at each level of third parties per page
Passing INP by third parties per page which level passes the INP most often
Third parties per page 3. p75 6. p99 14. At the low end (0): INP 44ms. At the high end (>p98): INP 72ms. computed
Why this matters for the Core Web Vitals, and where to start fixing it
Every third party on the page is code you invited but do not control. Each one adds connections, main-thread work, or both. The count is the simplest measure of how much of your page's fate is outsourced.
Counts only creep upwards. Tags get added for a campaign and survive it by years. Walk the list and remove every service nobody can name a reader for. Most sites can drop several without anyone noticing anything except better vitals.
How do third parties affect the Core Web Vitals?
Passing LCP barely moves across the range: 87% at one end, 83% at the other. This signal does not separate passing sites from failing ones.
The effect is bigger on CLS. With a couple of services, 82% of sites pass it. On the most tag-heavy sites, 72% do.
Chrome field data from 189,915 sites, representing millions of real page loads. How we measured.